There were reports of several television personalities being in the running to host The Late Show, including Neil Patrick Harris and Tina Fey.

However, it was announced earlier in the week that Colbert, who currently hosts the political comedy show The Colbert Report, has signed on to take over.

O'Brien, who was rumored to be in the running for the spot, revealed this week that he is happy for Colbert.

The funnyman, who moved his show to TBS after he was fired as host of The Tonight Show, told The AP that he was never considered to replace Letterman.

"I wasn't up for it," O'Brien said. "I'm very happy where I am, but I love Stephen. I think Stephen is great. I'm a huge fan of his as a comic and as a human being… I'm really glad that he got the job."